Backport commit 5b0cddd from Emacs

* doc/orgcard.tex: Change "GNU Emacs" to "this document" in copyright
notices.  (Bug#24520)

More fixes in copyright notices in etc/refcards/
5b0cddd91535025bbf0c69d17e2d4e470dd350c5
Eli Zaretskii
Tue Nov 15 19:01:07 2016 +0200

doc/orgcard.tex

@@ -20,7 +20,7 @@
 % Copyright (C) 1987, 1993, 1996-1997, 2001-2016 Free Software
 % Foundation, Inc.
 
-% GNU Emacs is free software: you can redistribute it and/or modify
+% This document is free software: you can redistribute it and/or modify
 % it under the terms of the GNU General Public License as published by
 % the Free Software Foundation, either version 3 of the License, or
 % (at your option) any later version.
@@ -31,7 +31,7 @@
 % instead of the usual distributed-under-the-GNU-GPL notice, and without
 % a copy of the GPL itself.
 
-% GNU Emacs is distributed in the hope that it will be useful,
+% This document is distributed in the hope that it will be useful,
 % but WITHOUT ANY WARRANTY; without even the implied warranty of
 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 % GNU General Public License for more details.